package com.xiaofan.demo_intercepter;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author: 晓帆
 * @:version 1.0
 **/
@Component
public class demo1 implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        request.setCharacterEncoding("utf-8");
        response.setContentType("html/text,charset=utf-8");
        HttpSession session = request.getSession();
        String  username = (String) session.getAttribute("username");
        if (username==null||username.trim().length()==0){
            response.getWriter().println("请先登录");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HttpSession session = request.getSession();
        String username = (String) session.getAttribute("username");
        if (username==null||username.trim().length()==0){
            modelAndView.setViewName("login");
        }

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion1");
    }
}
